54 lines
1.5 KiB
Haskell
54 lines
1.5 KiB
Haskell
{- misc utility functions
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-
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- Copyright 2010-2011 Joey Hess <joey@kitenet.net>
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-
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- Licensed under the GNU GPL version 3 or higher.
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-}
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module Utility.Misc where
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import System.IO
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import Control.Monad
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{- A version of hgetContents that is not lazy. Ensures file is
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- all read before it gets closed. -}
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hGetContentsStrict :: Handle -> IO String
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hGetContentsStrict = hGetContents >=> \s -> length s `seq` return s
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{- A version of readFile that is not lazy. -}
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readFileStrict :: FilePath -> IO String
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readFileStrict = readFile >=> \s -> length s `seq` return s
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{- Like break, but the character matching the condition is not included
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- in the second result list.
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-
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- separate (== ':') "foo:bar" = ("foo", "bar")
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- separate (== ':') "foobar" = ("foobar", "")
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-}
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separate :: (a -> Bool) -> [a] -> ([a], [a])
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separate c l = unbreak $ break c l
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where
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unbreak r@(a, b)
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| null b = r
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| otherwise = (a, tail b)
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{- Breaks out the first line. -}
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firstLine :: String -> String
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firstLine = takeWhile (/= '\n')
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{- Splits a list into segments that are delimited by items matching
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- a predicate. (The delimiters are not included in the segments.) -}
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segment :: (a -> Bool) -> [a] -> [[a]]
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segment p l = map reverse $ go [] [] l
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where
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go c r [] = reverse $ c:r
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go c r (i:is)
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| p i = go [] (c:r) is
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| otherwise = go (i:c) r is
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{- Given two orderings, returns the second if the first is EQ and returns
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- the first otherwise. -}
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thenOrd :: Ordering -> Ordering -> Ordering
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thenOrd EQ x = x
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thenOrd x _ = x
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{-# INLINE thenOrd #-}
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